I'll stick with my STAR (now ARES) replica, I've not had a chance to have a fondle of the WE offering...
the STAR one is 1" shorter in barrel length than the real one (easy fix) and this tosh about a polycarbonate GB is just that, seen too many "metal" ones break in ICS, G&G and ARMY, though ICS has the easier take down, the adjustable spring is a gimmick (I can do that with my Star / ARES one, its got a quick change spring system behind the butt plate).
It all depends what you want to do with it really, I'm sticking with my old skool A2, you want one of the new theater RIS'd ones, well the parts are awkward to get for any of them, as most sellers don't mention the replica its made for.